Jamie Parker and Samuel Barnett are playing Guildenstern and Rosencrantz respectively in Trevor Nunn's adaptation of Rosencrantz and Guildenstern Are Dead by Tom Stoppard. It's on in London until the 20th of August, more information
here. Previously it was on at the Chichester Festival Theatre, and production and rehearsal photos are on their website, which is
here.
I for one will certainly be going as seeing these two act together again will be a dream come true!